Abstract
Abstract The excitation functions of 208 Pb ( p , p 0 ) 208 Pb have been measured in the energy range E p = 14.2 to 17.4 MeV in 50 keV steps at θ lab = 120°, 140° and 160°. The isobaric analog resonances of the parent states in 209 Pb up to E x = 2.5 MeV and the optical-model background were fit simultaneously at all energies and angles. The spreading widths and the values of a parameter β 2 , which measures the isospin purity of the IAR, were determined for the g 9 2 , i 11 2 , j 15 2 , d 5 2 , and s 1 2 resonances. An average value of the isospin purity of β 2 = 66% was found.
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